Kai Xie created HADOOP-16158:
--------------------------------
Summary: DistCp supports checksum validation when copy blocks in
parallel
Key: HADOOP-16158
URL: https://issues.apache.org/jira/browse/HADOOP-16158
Project: Hadoop Common
Issue Type: Improvement
Components: tools/distcp
Affects Versions: 2.9.2, 3.2.0
Reporter: Kai Xie
Assignee: Kai Xie
Copying blocks in parallel (enabled when blocks per chunk > 0) is a great
DistCp improvement that can hugely speed up copying big files.
But its checksum validation is skipped, e.g. in `RetriableFileCopyCommand.java`
{code:java}
if (!source.isSplit()) {
compareCheckSums(sourceFS, source.getPath(), sourceChecksum,
targetFS, targetPath);
}
{code}
and this could result in checksum/data mismatch without notifying
developers/users (e.g. HADOOP-16049).
I'd like to provide a patch to add the checksum validation.
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